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Influence of Preparation Conditions on the Formation of Copper (II) Architectures with Pyrazine-2,3,5-tricarboxylic Acid

  • Wang, Feng-Qin (College of Environment and Chemical Engineering & Tianjin Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University) ;
  • Lin, Shu (College of Environment and Chemical Engineering & Tianjin Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University) ;
  • Guo, Ming-Lin (College of Environment and Chemical Engineering & Tianjin Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University) ;
  • Xu, Jun-Jian (College of Environment and Chemical Engineering & Tianjin Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University) ;
  • Wang, Xiao-Qing (College of Environment and Chemical Engineering & Tianjin Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University) ;
  • Zhao, Yong-Nan (College of Materials and Engineering & Key Lab of Hollow Fiber Membrane Materials & Membrane Process, Tianjin Polytechnic University)
  • Received : 2011.04.12
  • Accepted : 2011.05.29
  • Published : 2011.07.20

Abstract

Three new metal-organic copper(II) complexes, $[Cu(H_2PZTC)_2]_n{\cdot}2nH_2O$ (1), $[Cu(HPZTC){\cdot}2H_2O]_n{\cdot}2nH_2O$ (2), and $Cu_2[(PZHD)(OH)(H_2O)_2]_n$ (3) ($H_3PZTC$ = pyrazine-2,3,5-tricarboxylic acid, $PZHD^{3-}$ = 2-hydroxypyrazine-3,5-dicarboxylate), have been synthesized from $Cu(II)/H_3PZTC$ system under different synthetic conditions, and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy and thermogravimetric analysis. In complexes 1 and 2, $H_3PZTC$ ligands loose one and two protons, which were transformed into $H_2PZTC^-$ anion and $HPZTC^{2-}$ dianion under different preparation condition, respectively. Furthermore, two ligands coordinate with Cu(II) cations in different modes, leading to the formation of the different chain structures. In complex 3, $H_3PZTC$ ligand was converted into a new ligand-PZHD by in situ decarboxylation and hydroxylation under a higher pH value than that for complexes 1 and 2. PZHD ligands link the Cu(II) cations to form a 2D layer structure. These results demonstrate that the preparation conditions, including pH value and reaction temperature etc, play an important role in the construction of complexes based on $H_3PZTC$ ligand.

Keywords

References

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